<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style type="text/css">
    .tab ul {
        overflow: hidden;
        padding: 0;
        margin: 0;
    }
    .tab ul li {
        box-sizing: border-box;
        padding: 0;
        float: left;
        width: 100px;
        height: 45px;
        line-height: 45px;
        list-style: none;
        text-align: center;
        border-top: 1px solid blue;
        border-right: 1px solid blue;
        cursor: pointer;
    }
    .tab ul li:first-child {
        border-left: 1px solid blue;
    }
    .tab ul li.active {
        background-color: orange;
    }
    .tab div {
        width: 500px;
        height: 375px;
        display: none;
        text-align: center;
        font-style: 30px;
        line-height: 300px;
        border: 1px solid blue;
        border-top: 0px;
    }
    .tab div.current {
        display: block;
    }
    
    
    </style>
</head>
<body>
    <div id="app">
        <div class="tab">
            <ul>
            <li @click='change(index)' :class='currentIndex==index?"active":""' :key=item.id v-for='(item,index) in list'>{{item.title}}</li>
        </ul>
        <div :class='currentIndex==index?"current":""' :key=item.id v-for='(item,index) in list'>
            <img :src="item.path" alt="">
        </div>
        </div>
    </div>
    <script src="./vue.js"></script>
    <script>
        var vm = new Vue({
            el: '#app',
            data:{
                currentIndex: 0,  //选项卡当前索引
               list:[{
                id:1,
                title: 'apple',
                path:'img/apple.jpg'
               },{
                id:2,
                title: 'orange',
                path:'img/orange.jpg'
               },{
                id:3,
                title: 'lemon',
                path:'img/lemon.jpg'
               }]
            },
            methods:{
            change: function(index){
                //  实现选项卡切换:操作类名
                // 通过改索引值
                this.currentIndex = index;

            }
            }
        });
    </script>
</body>
</html>